<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        // var name = '小兰'
        // function say(){
        //     alert(name);
        //     var name = '小黄';
        //     console.log(name);
        // }
        // debugger;
        // say();


function Foo() {
    getName = function() {console.log(1)};
    return this;
}
Foo.getName = function() {console.log(2)};
// Foo.prototype.getName = function() {console.log(2)};
var getName = function() {console.log(4)};
function getName() {console.log(5)};

// Foo.getName();//2
// getName();//4
// Foo().getName();//1
// getName();//1
// new Foo.getName();//2
// new Foo().getName();//2
new new Foo().getName();//2 
    </script>
</body>
</html>